Pot jitters during ADC capture

[Ioannis]

Richard has good point regarding crappy source signal.

As noted before, if the pot is so bad it will be very difficult to clean the signal.

The r-c values depend on the signal frequency that they will filter. Your pot signal is really slow and needs big cap and resistor values, called time constant.

Having big r-c values driving Adc is difficult so a buffer is needed.

Ioannis